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Of the ingredients listed in Plaster of Paris the warning most likely pertains to crystalline silica which is in clay and acts as a drying agent. Like clay plasters that contain crystalline silica can be inhaled if you are not wearing the appropriate breathing apparatus. I remember when we where working with dry clay models in sculpture class the teacher warned us that inhaling silica dust causes silicosis and cancer because it is like inhaling glass. The same is true about asbestos and perlite (white volcanic glass). When you inhale crystalline silica the lymph cells of the immune system ingest the piece of glass lodged in the lungs and a sac is formed where the glass is housed in the body. As far as I know its fucking impossible to hock that shit up because it becomes attached to tissue in silicosis, and so it is a cancer causing hazard for this reason, like asbestos. So as long as you are not breathing the fine floaty glass dust. But none of those are toxic as far as I know. Calcium carbonate is like, baking soda or something fine. It should be cool, just wet it down while your working with it that is the primary hazard.